linux-kernel - Re: general protection fault in kvm_lapic_hv_timer_in

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Message-ID: <20190401195859.GA25411@linux.intel.com>
Date:   Mon, 1 Apr 2019 12:58:59 -0700
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     syzbot <syzbot+1c69d94fe42901b029c1@...kaller.appspotmail.com>
Cc:     dvhart@...radead.org, hpa@...or.com, jmattson@...gle.com,
        karahmed@...zon.de, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com,
        pbonzini@...hat.com, peterz@...radead.org, rkrcmar@...hat.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de, x86@...nel.org
Subject: Re: general protection fault in kvm_lapic_hv_timer_in_use

On Sun, Mar 31, 2019 at 02:08:00AM -0700, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 8fcc4b5923af5de58b80b53a069453b135693304
> Author: Jim Mattson <jmattson@...gle.com>
> Date:   Tue Jul 10 09:27:20 2018 +0000
> 
>     kvm: nVMX: Introduce KVM_CAP_NESTED_STATE
> 
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=127b4f43200000
> start commit:   234b69e3 ocfs2: fix ocfs2 read block panic
> git tree:       upstream
> final crash:    https://syzkaller.appspot.com/x/report.txt?x=117b4f43200000
> console output: https://syzkaller.appspot.com/x/log.txt?x=167b4f43200000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=5fa12be50bca08d8
> dashboard link: https://syzkaller.appspot.com/bug?extid=1c69d94fe42901b029c1
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10e14956400000
> 
> Reported-by: syzbot+1c69d94fe42901b029c1@...kaller.appspotmail.com
> Fixes: 8fcc4b5923af ("kvm: nVMX: Introduce KVM_CAP_NESTED_STATE")
> 
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

Another ancient bug, fixed by commit 26b471c7e2f7 ("KVM: nVMX: Fix bad
cleanup on error of get/set nested state IOCTLs")

#syz fix: KVM: nVMX: Fix bad cleanup on error of get/set nested state IOCTLs